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COSC1078 Introduction to Information Technology Lecture 16 Processes

COSC1078 Introduction to Information Technology Lecture 16 Processes. James Harland james.harland@rmit.edu.au. Introduction. James Harland Email: james.harland@rmit.edu.au URL: www.cs.rmit.edu.au/~jah Phone: 9925 2045 Office: 14.10.1 Consultation: Mon 4.30-5.30, Thu 11.30-12.30

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COSC1078 Introduction to Information Technology Lecture 16 Processes

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  1. Intro to IT COSC1078 Introduction to Information TechnologyLecture 16Processes James Harland james.harland@rmit.edu.au

  2. Intro to IT Introduction • James Harland • Email:james.harland@rmit.edu.au • URL:www.cs.rmit.edu.au/~jah • Phone:9925 2045 • Office:14.10.1 • Consultation:Mon 4.30-5.30, • Thu 11.30-12.30 • What colour is my office door? Carpet? Chair?

  3. Intro to IT Introduction to IT 1 Introduction 2Images 3Audio 4Video WebLearnTest 1 5 Binary Representation Assignment 1 6 Data Storage 7Machine Processing 8 Operating Systems WebLearn Test 2 9 Processes Assignment 2 10 Internet 11Internet Security WebLearn Test 3 12Future of IT Assignment 3, Peer and Self Assessment

  4. Intro to IT Overview • Questions? • Assignment 2 • Assignment 3 • Processes • Questions?

  5. Processes Lecture 16: Processes Intro to IT

  6. Processes A program is astatic set of instructions A processes is the execution of a program, which changes state over time. Lecture 16: Processes Intro to IT

  7. Processes Executing in Context Processor Memory Disk ROM CC 00 Program Counter RAM CC Instruction Register Lecture 16: Processes Intro to IT

  8. Processes Executing in Context Processor Memory Disk ROM DD 00 Program Counter RAM CC DD Instruction Register Lecture 16: Processes Intro to IT

  9. Processes Switching Scheduler maintains process table Ready Ready Waiting Lecture 16: Processes Intro to IT

  10. Processes Switching Lecture 16: Processes Intro to IT

  11. Interrupts • Signals to the CPU • Often generated by timing circuits • CPU reacts by jumping to appropriate memory location • Dispatcher • selects a ready process • resets timing circuit • starts process • CPUs often designed to switch process states efficiently Lecture 16: Processes Intro to IT

  12. Processes Executing in Context Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  13. Processes Executing in Context Processor Memory Disk 00 11 ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  14. Processes Executing in Context Processor Memory Disk 00 FF ROM Program Counter RAM FF Instruction Register Lecture 16: Processes Intro to IT

  15. Processes Executing in Context Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  16. Processes Executing in Context Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  17. Processes Executing in Context Processor Memory Disk 00 FF ROM Program Counter RAM FF Instruction Register Lecture 16: Processes Intro to IT

  18. Processes Executing in Context Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  19. ``Thomas, you wouldn’t! Naughty!’’ Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  20. ``Thomas, you wouldn’t! Naughty!’’ Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  21. ``Thomas, you wouldn’t! Naughty!’’ Processor Memory Disk 00 BB ROM Program Counter RAM BB Instruction Register Lecture 16: Processes Intro to IT

  22. Software • `Programs should be able to do anything!’ (???) • Programs should be able to do anything reasonable • What is reasonable? • Not changing OS, not deleting other processes from memory, not playing with other people’s things, … Lecture 16: Processes Intro to IT

  23. Interrupts • Provide mechanism to switch processes • CPU doesn’t have to wait for I/O transfers • Switching leads to faster throughput • `Save document’ means CPU does something else while the save takes place Lecture 16: Processes Intro to IT

  24. Intro to IT Conclusion • Work on Assignment 2 (and 3?) • Web Quizzes and Web Test 2 • Finish reading book!

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